Acquisition Phase

Phase Included

Scan Delay

Respiration Phase

Anatomical Coverage

Non Contrast

Yes

N/A

N/A

2cm below mandible through 2cm above vertex

Arterial Phase

N/A

N/A

N/A

N/A

Venous Phase

N/A

N/A

N/A

N/A

Delayed Phase

N/A

N/A

N/A

N/A

Scan Comments: Iso-centering the patient within the gantry is key to image quality. All scans are performed using the ALARA principle. 3D post-processing is performed with this protocol.

 

Technical Parameters

Parameters

kVp

120

Effective mAs

CareDose

Care Dose Reference mAs

250

Time (Rotation)

1.0 sec

Average Acquisition Time

6-8 sec

Collimation

128 x 0.6mm

Pitch Value

0.55

Scan Direction

Caudocranial

Comments: CareDose is used to reduce patient dose.

 

Reconstruction Parameters

Bone

Soft Tissue

Thin Data

Thin Data

Slice Thickness

2 mm

2 mm

0.6 mm

0.6 mm

Reconstruction Spacing

2 mm

2 mm

0.6 mm

0.6 mm

Reconstruction Algorithm

H60s

H30s

H60s

H30s

Window Width and Level

2500/500

350/50

2500/500

100/30

Reconstruction Comments: An open DFOV is used to include the nose and posterior skull. 3D VRT reconstructions are performed in these cases (360 degree spin and 360 degree tumble).

 

Reconstruction Parameters

Thin Data

Thin Data

Coronal

Sagittal

Slice Thickness

0.75 mm

1 mm

0.6 mm

0.6 mm

Reconstruction Spacing

0.5 mm

1 mm

0.6 mm

0.6 mm

Reconstruction Algorithm

H20s

H60s

H60s

H60s

Window Width and Level

350/50

2500/500

2500/500

2500/500

Reconstruction Comments: An open DFOV is used to include the nose and posterior skull. 3D VRT reconstructions are performed in these cases (360 degree spin and 360 degree tumble).

 

Contrast Parameters

Parameters

Contrast Type

N/A

Contrast Volume

N/A

Saline Flush

N/A

Injection Rate

N/A

Oral Contrast

N/A

Contrast Volume

N/A

Comments: IV contrast is not typically necessary for this exam.